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r <br />PART I <br />Page S <br />Permit No. COG-850000 <br />B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS <br />1. Effluent Limitations <br />(a) Active Mining (Continued) <br />Any discharge or increase in the volume of a discharge caused by <br />precipitation within any 24-hour period rester than the 10- ear, <br />24-hour precipitation event (or anowmelt of equivalent volume <br />comply with the following limitations subject to burden of <br />proof requirements described in Part I.B.l.d). <br />Flow, MGD - monitoring only per Part I.B.2.a <br />Total Dissolved Solids, mg/1 - monitoring only per Part I.B.2.a <br />(Colo. River Basin Only) <br />Total Phosphorus (as P), mg/1 - monitoring only per Part i.B.2.a, <br />(Dillon Reservoir drainage only) <br />pH shall remain between 6.5 and 9.0 s.u. c/. <br />OII and grease shall not ezceed 10 mg/1 c7 nor shall there be a <br />visible sheen f/. <br />(b) Post-Mining <br />Effluent Parameter <br />Discharge Limitations <br />Maximum Concentration <br />Daily Mazimum c/ <br />Flow, MGD Report <br />Settleable Solids, ml/1 h/ + 0.5 <br />Total Dissolved Solids, mg/1 (Colorado River Hasin Only) Report <br />Total Phosphorus (as P), mg/1 (Dillon Reservoir Drainage Only) Report <br />pH shall remain between 6.5 and 9.0 s~u. c/. <br />Oil and grease shall not ezceed 10 mg/1 c/ nor shall there be a visible sheen f/ <br />Any discharge or increase in the volume of a discharge caused by <br />precipitation within any 24-hour period rester than the 10- ear, <br />24-hour precipitation event (or snowmelt of equivalent volume <br />comply with the following limitations subject to burden of proof <br />requirements described in Part I.B.l.d). <br />Flow, MGD - monitoring only per Part I.B.2.b <br />Total Dissolved Solids, mg/1 - monitoring only per Part I.B.2.b <br />(Colo. River Basin Only) <br />Total Phosphorus Gas P), mg/1 - monitoring only per Part I.B.2.b. <br />(Dillon Reservoir drainage only) <br />pH shall remain between 6.5 and 9.0 s.u. c/. <br />Oil and grease shall not ezceed 10 mg/1 cT nor shall there be a <br />visible sheen f/. <br />See part I.B.3. far Footnotes <br />